Gear-pump.



G. A WOOD.

GEAR PUMP.

APPLICATION FILED MAR. 15. 1915.

Patented July 9,1918

2 SHEETS-SHEET 1.

IIIIII/IIIII/I I M27010? 7% J63 ar/7W0 l9 WWO,

e. A. WOOD.

GEAR PUMP.

APPLICATION FILED MAR. I5. 1915.

Patented July 9, 1918..

2 SHEETSHEET' 2.

STATES m GARFIELD A. woo'n, ornn'rnorr, moment.

, GEAR-PUMP.

To all whom it may concern: i Y

Be it known that/I, GARFIELD A. W001), a citizen 'of the United States, and aresident of Detroit, in the county of W ayncv and State of Michigan, have invented anew and Improved Gear-Pump, of which the fol lowing is a specification.

In the use of gear oil pumps, much 'difiiculty is experienced due tothe fact that the pressure of the liquid becomes equalized on all parts of the gear shaft bearings, thus .preventing circulation and causing them vention is to p'rovide, within the pump 'casing, means whereby the liquid may be drawn 1' from a reservoir and deliveredthrough'the gears to a pressure chamber, or may be by- I passed fromthepre'ssure chamber back to out off the discharge passage is of one embodiment the reservoir, or ma be circulated in the casing itself at will, file pump running continuously if desired. The invention also includes the use of passages and valve means of such nature that, even with a constantly running pump, all possibility of the valve means being so manipulated as-to suddenly eliminated. The nature of the invention will more fully appear from the description and ap-- pended drawings, are shown".

In the drawings,

Figure 118 a side View of my invention, parts being broken away and the'gears and gear shafts being removed. Fig. 2 is a sectionv V for oil from the admission to. the exit on the line 22 ofFi g. 1. Fig. 3 is a diagrammatic sketch showingone manner of connecting the pump'to a hoisting device. Fig. 4' isa longitudinal section through a bushing for the bearing in which the projectingend of the driving shaft is supported. Fig. 5 isa section on .theline 5-5 of 4. Fig. 6 .is a vertical section through a modified form ofipump, thegea'rsbeing. .rem vggl Fig; 7 .is a

showingfthe gears and: adjacent passages! S'pecijicatirin of LettersPatent. Application filed March 15, 1915. seriarm. 14.4.79.

from the suctionside of the pump wherein two embodiments agmentary section I broughtthrough Patented July a, 1918;.

Fig.8 is a sketch showin ner of connecting the mo lfied form of; pump -'to a hoisting mechanism.

-- In the' embodiment of my invention shown in Figs. 1 to 5,. inclusive, the bodyl of the pump casing, andthe cover 2 together form a block (as shown, rectangular, but the .shape may bevaried) and are provided with .the alined bearing, boxes 3 and 4 for the driven pump gear, and with the alined bearing boxes 5 and 6 for the driving gear, the three first mentioned boxes being closed at'their outer ends, and the box 6' being" threaded to receive the stuffing box 7 of ordinary construction. 5 are lined with the bushings 8, each of which, has a longitudinal, oil admission groove- 9 formed in its inrier surface and a siniilar" oil exit passage 10 on the sideoppoa preferred man- The boxes 3, 4 and site the inlet groove; and the box 6 is lined I,

- with'a bushing 12 having an oil inlet groove 15 aiid' an exit groove 16 that may.v be digmetrically related to each other. The last i mentioned grooves preferably terminate slightly inwardly from the outer edge of the bushing and are joine by ,the circumferential'groove 17. The in et passages 9 and 15- may be omitted in certain instances as in ,high pressure pumps the leakage through i the bearing is suflicient to accomplish the purpose. .7

Mounted in the oppositely locatedbush- 'ings" 8 is'a shaft 21 upon'which is keyed the driven gear 22 of thepump; and the third bushing 8 together with the bushing 12,

- supports the driving shaft '23 to which the grooves. 7. Each. of thepump'gears includes the usual gear teeth 28, and is of a length to fit closely -between the body 1 and cover 2 of the pump casing,-and-, in operation, turns in the direction indicated by the arrows in Fig. 7.

/ Thebody of the casing is provided with the intake passage.29, to which liquid maiyr be the nipple 30 and om through the stufling which branch the feed passage 31 and the I the hoisting device as shown-m I lation of the liquid will take a nipple 39 secured in place by the bolts 40' and having threaded thereon the perforated cap 42 by which a connection may be made 7 to the discharge pipe 43, having the annular flange 4.4 around its inner end. A .jamb washer 45 may be interposed between the end of the nipple and the discharge pipe, if desired. The intake passage may also have an opening 48 (closed in the present embodiment by the late (l9) ,jthe function of which will appear ater.

' In orderto connect the grooves 10 and 16 to the suction passage 31, the body 1 is grooved as indicated at 50 (Fig. 1), and the cover 2 is provided with similar grooves (not shown) and the body and cover are milled out or groovedat 51 and 52, respectively, to allow the escape of-liquid from the end of the gears as the teeth 28 engage with each other, whereby locking of the gears is avoided. v 1 p The present invention, while. of general utilit for pumpmg purposes, is particularly suita' lefor use in connection with a/fixed' hoisting-cylinder (Fig. 3) and movable piston 61 of an'automobile truck, the space between the piston rod 62 and the cylinder 60 being utilized for storage, and being incommunication with thenipple 30 through the passages 64, jacket 65 and pipe .66.. The

discharge pipe 43 is connected to the lower end of the cylinder at 67. Consequently,

with the motor continuall running, theso that liquid valve .33 maybe turned (lst will'be sucked from the '11 per side of the piston and delivered tothe' ower side there of to hoist a load, or j;(- 2 nd). so that the weight on the piston will'iorce the liquid in v the, reverse direction (by-'passin t Pu p or (3rd) so that a continual circuthe pump casing, as shown in I W V The modification shown in Fig.6 differs from that heretofore described in that the passage 38 is closed by. a plate 70, thepassage 48 being connected to an intake pipe 7 by means of the gland or nipple 72. In this instance the liquid is discharged throu h the nipple 30, which itwill bejremember stitutes an inta e 1d Pump maybe conveniently installed Fig. 8

The pump shown, in Fig from that previously described in this; important particular :-it, is'provided with a port 73 of such length as to };')1 'ev1 mt''an enplace within ig;:.-1.

I assa e in the 6mb0di 'ment first described T em difi' ,7 n e f. bered therein, said casing .havmga cont conduits, in which case the'liquid is 'dis- 75 charged as fast as received it mayclosethe discharge passage 29, thus causing a constant circulation within the pump casing; or it may partly close the connection between the intake and discharge passagesto Y vary the rate of pumping. The pump shown in Fig. 1 may of course be provided with a port similar-to In either instance the pump may have lugs 75 .for the reception of bolts 76, wherea by it may be attached to any desired support 77. I f It 'is clear that many changes may be made in the details of construction without. i

capacity of. the casing being but a small fraction of that of the closedsystem as a /whole, a pair'of meshing pump gears chambered therein, said casing having'a contine opening, or may be admitted through "the I last mentioned opening and discharged through the-first mentioned opening without passing through the pump gears, or may be circulated continuously through? the pas sage, as desired, said valvemeans and the ass'ociatedpassages being so arranged that 3 the valve means is incapableof entirelypreventing the escape of liquid fromthe-discharge side of the 2. A device for 'J i-ng aclosed'systein including a casing, the

capacity of the casing being-but asmall 4 .1 fraction of that of the 010 wholqa pair of meshing pump *g'earsfhhani- .ous passage}, other than the gear chainher -extending mm the deliver 'jside ofith'e casing also haying two openings leading to the passage and valve means whereby liquid 13,0

1. A device for handling liquid compris- .95 I ing a'closed system including acasing, the

E e- I and ing liquid comprisd ,sy emjlasi a" pump gears to the suction si e thereof, 'saidi last mentioned opening may be either admitted through one of these openings in such direction as to pass to the suction side of the gears and be discharged through the discharge passage and the other opening, or may be admitted through the and discharged thrdugh the first mentioned opening without passing through the pump gears, ormay be circulated continuously through the pas- 1 direction as to pass for preventing sage, as desired, and means obstructmg the valve means-from entirely 'the flow of liquid from the discharge passage, whereby sudden shocks on the pump gears are avoided.

3. A device for handling liquid comprising a closed system including a casing, the

capacity of the casing being but a small fraction of that of the closed system as .a whole, a pair of meshing pump gears chambered therein, said casing having a continuous passage other than the gear chamber extending gears to the suction side thereof, said casing also having two openings leading to the passage, and valve means inclosed by said casing whereby liquid may be either admitted through one of these openings in such to the suction side of the gears and be discharged through the discharge passage and the other opening, or may be admitted through the last mentioned opening and discharged through the first mentioned opening without passing through the pump gears, or may be circulated continuously through the passage, said valve means and the associated passages being so arranged that the valve means is incapable'of entirely preventing the escape of liquid from the pump gears.

4:- A device for handling liquid comprising a closed system including a casing, the capacity of the casing being but a small fraction ofthat of the closed system as a whole, a pair of meshing pump gears chambered therein, said casinghaving a continu ous passage other than the gear. chamber extending from the delivery side of the pump gears to the suction side thereof, said casing also having two openings leading to the passage, and valve means inclosed by said casing whereby liquid may be either one of these openings in admitted through such direction as to pass to the suction side of the gears and be discharged through the discharge passage and the other opening, or may be admitted through the last mentioned opening and discharged through the first mentioned opening Without passing through tinuously through the passage, and means for preventing the from entirely. obstructing the flow of'li enf be circulated conas desired, valve means the pump. gears, or may from the discharge passage, whereby su shocks on the pump gears are avoided.

from the delivery side of the pump these openings in such direction as to as desired,

discharge side of the 5. A device for handling liquid comprising a casing, a pair of meshing pump gears chambered therein, said casing having a continuous passage, other than the gear chamber extending frombthe delivery side of the pump gears to the suction side thereof, said casing having three openings leading thereto; a plate for closing either one of two of the openings, and 'valve means whereby liquid may be either admitted through one of these openings in such direction as topass to the suction side of the gears and be discharged through the discharge passage and the other opening, or may be admitted through the last mentioned opening and discharged through the first mentioned opening without passing through the pump gears.

6; A device for handling liquid comprising a closed system including a casing, the capacity of the casing being but a small fraction of that of the closed system as a whole, a pair of meshing pump gears chambered therein, said casing having a continu- Olls passage other than the gear chamber extending from the delivery side of the to the suction side thereof, said casing also having two openings leading to the passage, and valve means whereby liquid may be either admitted through one of pass to the suction side of the gears and be discharged through the discharge passage and the other opening, or may be admitted through the last mentioned opening and dis charged through the first-mentioned opening without passing through the pump gears, or may be circulated continuously through the passage, as desired, said casing having an unobstructed'by-pass formedtherein opposite the valve means whereby the latter is prevented from entirely obstructing the flow of liquid from the discharge passage.

7. A device for handling liquid comprissystem including a casing, the the casing being but .a small that, of the closed "system as a pump gears ing a closed capacity of fraction of whole, a pair of bered therein, said casing having a continuous passage extending from the delivery side of thepump gears to the suction side thereof, said passage lying substantially in the plane of the gears, said casing also having two openings leading to the passage, and valve means whereby liquid may be either admitted through one of these openings in such direction as to pass to the suction side of the'gears and be discharged through the discharge passage and the othenopenirfg, or may be admitted through the last mentioned opening and discharged through the first mentioned opening without passing through the pump gears. 8. In combination witha fixed hoisting cylinderand a piston'and piston rod mov-- meshing pump gears chamthe. delivery I suction side thereof, said casing also having I cylinder and a piston and piston rod moving without passing through the 50gears, or may be circulated continuously able up and down therein, a. casing, a pair of meshing pump gears chambered therein, said casing having a continuous passage other than the gear chamber extending from side of the pump gears to the two openings leading to the passage, pa s sage formingmeans leading. from one of theopenings to a the plston, 0t

valve means inclosed by said casing whereby liquid may be either admitted through one of these openings in such direction as to pass to the suction side of the gears and be dis charged through the discharge passage and the other opening, or may be admitted through the last mentioned opening and discharged through the first mentioned opening without passing through the pump ears. a b 9. .In combination, with a fixed hoisting able lip and down therein, a casing, a pair of meshing pump gears chambered therein,

said casin havin a continuous assa 'e g Y e other than the gearchamber extending from the delivery side of the pump gears to the suction side thereof, said casing also having two openings leading to thepassage, passage forming means leading from one of the openings ,to a point in the cylinder beneath the piston, other passage forming means i leading from the other opening to a point in the cylinder near the upper end thereof,

the casing being but a small fraction of that of the cylinder, and

the cubical contents of valve means inclosed by said casing whereby liquid may be either admitted throughone of these openings in such direction as to pass a to the suction side of the gears and be discharged through the discharge passage and the other opening, or may be admitted through the last mentioned opening and. discharged through the first mentioned openthrough the ing, a pair of meshing pump gears chambered thereln, a passage other than the gear passage, as desired.

chamber entirely inclosed within the block casing and extending from the suction side of the pump gears to the delivery side thereof whereby the use of projecting connections is avoided and a compact device is secured, a

suction passage in said casing, a delivery passage also in said casing, and a single valve in said first mentioned passage whereby liquid maybe admitted through the suction passage to the firstnamed passage and discharged through the delivery passagecapacity of the casing system as a whole, a

gear pump comprising a block cascation with the 'last after passing/through the pump gears or 'may be admitted through the delivery passage and discharged through the suction pas- -1- bered therein, a passage other than the gear chamber entirely inclosed within theblock casing and extending from the suction side of the pump gears to the delivery side thereof whereby the use of projecting connections is avoided and a compact device is secured, a suction passage in said casing, a' delivery passage also in said vcasing, and a single valve located at the point of connection of one of the two last named passages and the first named passage whereby liquid may be admitted through the suction-passage to the, first named passage and discharged through the deliver passage after passing through the pump gears, or may be admitted through the delivery passage and discharged through the suction passage -with0ut through the gears, g

12. A device for handling liquid comprising a closed system including a casing, the being but a small fraction of that of the pair of meshing'pump gears chambered in the casing, a single passage inclosed by the casing and leading from thedelivery side of the pump gears to the suction side thereof, said passage having two openings, means for passing driving the pump gears continuously, and

valve means whereby 'liquid'may be either admitted through one of the openings in such direction as to pass to the suction side of the gears and be discharged through the passage and the'other opening, or. may be admitted through the last mentioned open ingand discharged through the first mentioned opening without inducing stress upon the rotating pump gears.

13. In combination, a fixed cylinder and a piston and piston'rod slidable therein, a casing, passage forming means for conducting liquid from the casing to the cylinder at one side of the piston, other passage forming means for conducting liquid from a point in the cylinder near the opposite end thereof to the casing, the capacity of the casing being but a small fraction of that of the cylin-' der, a pair of meshin pump gears chamberedin the casing, a single passage leading from the delivery side of the pump gears to the suction side thereof, said passage having two openings, one in communication with the 'first mentioned passage forming means, the other opening being in communimentioned passage forming means, means for driving the pump gears continuously, and valve means whereby liquid may be. either admitted throughf I one of the openings in such direction as to vpass to the suction side of the gears and be 1 14. A gear pump comprising a block casing, a pair of meshing pump gears chambered therein, a passage other than the gear chamber entirely inclosed Within'the block casing and extending from the suction side of the pump gears to the delivery side there of whereby the use of projecting connections is avoided and a compact device is secured, a suction passage in said c'aslng, a

delivery passage also in said casing, and a single valve in said first mentioned passage whereby liquid may be admitted through the suction passage to the first named passageand discharged through the delivery passage after passing through the pump gears 01' may be admitted through the delivery passage and discharged through the suc tion passage Without passing through the gears, said valve and the associated passages being so arranged that the valve is incapable of entirely preventing the escape of liquid from the discharge side of the pump gears.

15. A gear pump comprising a thin block casing, a pair of meshing pump gears chambered therein, a passage other than the ear chamber entirely inclosed within the b ock casing and extending from the suction side of the pump gears to the delivery side thereof in the plane of said gears whereby the use of projecting connections is avoided and a compact devlce is secured, a. suction passage'in said casing, a delivery passage also in said casing, and a single valve located at the point of connection of one of the two last ,named passages and the first named passage the valve projecting from one side only of the casing andbeing rotatable about an axis parallel to the axes of the pump gears, whereby liquid may be admitted through the suction passage to the first named passage and discharged through the delivery pas- ,sage after passing through the pump gears,

or may be admitted through the delivery passage and discharged through the suction passage'without passing through the gears.

In testimony whereof I sign this specification in the presence of two subscribing witnesses. I

GARFIELD A. WOOD. 1

Witnesses:

L. M. SPENCER, MrmLEN M. WOOD. 

